Composition of matter and method of preserving and fireproofing wood.



mable in order to prevent the time the pit timbers have to be protected accomplished by impregnating the timbers; of ditterent acids. Of the c-naphthalene but the substances which render the wood sulfonates, the zinc and magnesium salts unintiammable are not the same as those are especially suitable. which afford a sure protection againstrot- The method may be carried out by preting. Consequently, the agents hitherto paring a single solution of the three kindsemployed to lessen the intlalmnability and of salts in the warm, and introducing it into 80 preserve the wood could not be introduced the wood in the known manner. The salts intothe wood simultaneously. Even when may, however, be introduced into the wood substances are used that do not react chemseparately. For example, zinc a-naphthaieally on each other, a separation of the inlene sulfonates may be introduced first, and dividual substances from the in'ipregnating then a solution of ammonium and magne- 85 liquid takes place. \Vhen separate imprcg simn sulfates. Ammonium sulfate and magnation is practised, the precipitation of the ncsium sulfate may also be introduced in one substance prevents penetration by the separate solutions and in any desired serial solution of the second substance. order; and the c-naphthalene sulfonate may It now appears that protection of the be introduced last of all. 90 wood against intianunability and rotting is Example: \Vood is treated, in accordance secured when the wood contains simultawith one of the known methods of impregneously, salts of magnesium, salts of amnation, pressure and a vacuum being used, monium and salts of oc-naphthalene sulfonic with a hot solution of 200 parts of magacid. nesium sulfate, 100 parts of ammonium sul-' 95 i The impregnation of the wood with salts fate, 25 parts of zinc or naphthalene slidfoof a naphthalene sulfonic acid is new. It hate, in 1000 parts of water. is true that zinc fi-na'phthalene sult'onate has WVe claim: already been used for preserving wood; but 1. The process for preserving wood and this substance cannot be used in presence of rendering it uninilamn'iable which consists '10 are: rear ores.

FRIEDRICH SEIIDENSCHNUR, 0F GHABLOTTENBURG, AND

HALENSEE,

JULIUS DEHNST, 0F NEAR BERLIN, GERMANY.

COMPOSITION OF MATTER AND METHOD OF PRESERVING AND FIREPROOFING WOOD.

Specification of Letters Patent. Patented Oct. 15, 1912. Application filed July 18, 1912. Serial No. 710,176.

salts of ammonium and magnesium, being salted out by the necessary ,quantities of other salts.

The property of a-naphthalene sulfonates 1,041,681. No Drawing.

To all whom it may concern:

Be itlmown that we, Fmsuiuon SEIDEN- sermon, chemist, and Jrmus Dnrmsr, chemist, subjects of the King of Prussia,

German Emperor, residing at 12 Holtzenutilized in the present method, namely that dortf street, Charlottenburg, near Berlin, they are not salted out by salts of ammo Kingdom of Prussia, German Empire, and nium and magnesitmi, is the more surprising l5 Joachim Friedrich street, Halensee, near because zit-naphthalene sulfonates are salted Berlin, Kingdom of Prussia, German Emout by many salts, such as sodium chlorid, pire, respectively, have invented a new and especially during cooling. Since when the useful Improvement in Compositions of wood. and the hot impregnating liquor are Matter and Methods of Preserving'antl Firebrought into contact, the latter must necesproofing lVood; and we do hereby declare sarily undergo cooling, especially inside the the following to be a full, clear, and exact cold wood, and a deposition of the a-na'phdescription of the same. thalene suifonates in the outer layers of the This invention relates to a composition of wood was to be expected, the use of the matter and a method of preserving and fireoenaphthalene sulfonates did .not initially proofing wood. 7 seem to promise success.

Accidents in mines have demonstrated the Among the magnesium and ammonium necessityfor rendering pit timbers non-fiamsalts, the sulfonates in particular have been great d anger tound applicable, though the chloridsor Atthe same phosphates can also be used. Even double salts may be employed, for example sodium magnesium sulfate. The salts may be those to human life from pit fires.

against rotting. In both cases the result is in impregnating the Wood with salts of ami In testimony whereof, we hays igned our monium, salts of magnesium and salts of names to this specification in the presence 10 can-naphthalene sul fonic acid. of two subscribing witnesses.

2. Solution for preserving W006. and ren- FRIEDRICH SEIDENSCI-INUR.

5 dating it; noninflamm ble composmfi of an JULIUS DEHN S1.

ueous solutlqn' of salts; of an'nnnnium, Witnesses: ts of magneslum and salts of anaphtha- HENRY HASPER,

le'ne sulfonic agid. v WOLDEMAR I'IAUPT. 

